rein R3 and R4 are ethylene groups and n is 2), pentaethylenehexamine (a compound wherein R3 and R4 are ethylene groups and n is 3), heptaethyleneoctamine (a compound wherein R3 and R4 are ethylene groups and n is 5), N,N???-bis(3-aminopropyl)-ethylenediamine (a compound wherein R3 is an ethylene group, R4 is a trimethylene group and n is 1), or N,N???-bis(2-aminoethyl)-1,4-butanediamine (a compou